found: McGraw-Hill dict. of sci. and tech. terms, c2003(bioturbation [GEOL] The disruption of marine sedimentary structures by the activities of benthic organisms)
found: Wikipedia, Aug. 6, 2008:Bioturbation (In oceanography and limnology, bioturbation is the displacement and mixing of sediment particles by benthic fauna (animals) or flora (plants). The mediators of bioturbation are typically annelid worms (e.g. polychaetes, oligochaetes), bivalves (e.g. mussels, clams), gastropods, holothurians, or any other infaunal or epifaunal organisms) ... Bioturbation is a diagenetic process and acts to alter the physical structure, as well as the chemical nature of the sediment; Soil bioturbation. In soil science, bioturbation is the physical rearrangement of the soil profile by soil life ... Bioturbation was initially unrecognized as a pedogenic force. The term didn't exist before 1952, when bioturbation was coined to aid in ichnological assessments. Bioturbation appeared in the soil and geomorphic literature in the early 1980s ... Bioturbation by burrowing animals results in soil landscapes that are both polygenetic and polytemporal.)
found: The free dictionary Web site, Aug. 6, 2008(provides two definitions for bioturbation: The stirring or mixing of sediment or soil by organisms, especially by burrowing or boring; The stirring or mixing of sediment or soil by organisms, especially by burrowing, boring, or ingestion)
found: Conference "Bioturbation: An update on Darwin's last idea" Web site, Aug. 6, 2008("Bioturbation refers to the biological reworking of soils and sediments, and its importance was first realized by Charles Darwin, who devoted his last scientific book to the subject. More than one hundred twenty-five years later, many studies within the biogeosciences (ecology, paleontology, biogeochemistry, sedimentology) now cite Darwin as the original reference.")
found: LC database, Aug. 6, 2008(bioturbation; macrofaunal bioturbation; bioturbation structures)
notfound: Web. 3;Amer. Heritage dict. of the Engl. lang., c2000;Henderson's dictionary of biological terms, 2000
